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-newport: Various improvements. [Ryan Holtz]

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* Added alpha blending support.
 * Reimplemented integer-line based on pseudocode in SGI REX3 docs.
 * Added correct fractional-line support based on pseudocode in SGI REX3 docs.
 * Fixed off-by-one in Length32 handling.
 * Fixed erroneous advancing of start_y when in span mode.
 * Added 12-bit CI mode to framebuffer readout.
 * Added basic (untested) overlay/underlay support.
 * Added Length32 flag handling to line drawing.
 *
This commit is contained in:
mooglyguy 2019-05-06 19:27:03 +02:00 committed by MooglyGuy
parent 8d94c7f859
commit a169023d42
2 changed files with 676 additions and 271 deletions
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920
src/devices/bus/gio/newport.cpp
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27
src/devices/bus/gio/newport.h
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@ -12,7 +12,7 @@
#include "gio.h"
#include "screen.h"
#define ENABLE_NEWVIEW_LOG (1)
#define ENABLE_NEWVIEW_LOG (0)
class newport_base_device : public device_t
, public device_palette_interface
@ -108,6 +108,10 @@ protected:
int32_t m_y_start;
int32_t m_x_end;
int32_t m_y_end;
int16_t m_x_start_frac;
int16_t m_y_start_frac;
int16_t m_x_end_frac;
int16_t m_y_end_frac;
int16_t m_x_save;
uint32_t m_xy_move;
int16_t m_x_move;
@ -158,7 +162,12 @@ protected:
uint32_t m_config;
uint32_t m_status;
uint8_t m_xfer_width;
bool m_read_active;
uint8_t m_plane_enable;
uint8_t m_plane_depth;
uint32_t m_store_shift;
uint8_t m_src_blend;
uint8_t m_dst_blend;
uint8_t m_logic_op;
};
struct cmap_t
@ -198,11 +207,21 @@ protected:
uint32_t get_rgb_color(int16_t x, int16_t y);
void do_v_iline(uint32_t color);
void do_h_iline(uint32_t color);
struct bresenham_octant_info_t
{
int16_t incrx1;
int16_t incrx2;
int16_t incry1;
int16_t incry2;
uint8_t loop;
};
uint8_t get_octant(int16_t x1, int16_t y1, int16_t x2, int16_t y2, int16_t dx, int16_t dy);
void do_fline(uint32_t color);
void do_iline(uint32_t color);
uint32_t do_pixel_read();
uint64_t do_pixel_word_read();
void do_rex3_command();
vc2_t m_vc2;